id:A153590 - OEIS Search Results

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Primes p such that p^2+3p+1 is also prime.

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2, 3, 5, 7, 19, 23, 29, 37, 43, 47, 53, 59, 67, 113, 137, 139, 157, 163, 173, 179, 229, 239, 257, 263, 293, 313, 349, 353, 359, 373, 379, 419, 449, 467, 499, 503, 509, 547, 577, 587, 593, 617, 643, 647, 653, 719, 727, 797, 883, 929, 967, 983, 997, 1013, 1033, 1049 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`For p = 2, p^2+3p+1 = 11 is prime; for p = 67, p^2+3p+1 = 4691 is prime; for p = 419, p^2+3p+1 = 176819 is prime.`
	PROGRAM	`(MAGMA) [ p: p in PrimesUpTo(1050) \| IsPrime(p^2+3*p+1) ];`
	CROSSREFS	`Sequence in context: A048403 A000519 A129693 this_sequence A025019 A140327 A163074` `Adjacent sequences: A153587 A153588 A153589 this_sequence A153591 A153592 A153593`
	KEYWORD	`nonn`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Dec 29 2008`
	EXTENSIONS	`Edited and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Jan 01 2009`

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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.

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